atonia
Học thuậtThân thiện
Definition
Noun: A state characterized by a lack of normal muscular tension or tonus; the absence of muscle tone.
Usage
The word "atonia" is a technical medical term. It is used to describe a pathological condition where muscles are abnormally limp, flaccid, or lacking in firmness. It is often discussed in the context of neurological disorders, sleep physiology (e.g., muscle atonia during REM sleep), or as a symptom of various diseases.
Examples
- The patient's atonia made it difficult for him to maintain an upright posture.
- During REM sleep, a state of muscle atonia prevents us from acting out our dreams.
- The neurological examination revealed significant atonia in the limbs on the left side.
Advanced Usage
- Sleep Atonia: This specific term refers to the natural paralysis of major muscle groups that occurs during the rapid eye movement (REM) stage of sleep. It is a protective mechanism.
- Atonic: The related adjective form, meaning "relating to or characterized by atonia." For example, an "atonic seizure" is a type of epileptic seizure involving a sudden loss of muscle tone.
Variants and Related Words
- Atony: An alternative spelling with the same meaning.
- Hypotonia: A related but distinct term meaning decreased muscle tone, which is less severe than a complete lack of tone (atonia).
- Flaccidity: A general descriptive term for limpness, often used synonymously with atonia in a clinical context.
Synonyms
- Flaccidity
- Lack of muscle tone
- Muscular flaccidity
Antonyms
- Hypertonia (excessive muscle tone)
- Spasticity
- Rigidity
Noun
- lack of normal muscular tension or tonus